these 3 derivations will be built:
  /nix/store/yn94j6pa1jsaf91d24snmlhal4rfx6rl-vendor-cargo-deps.drv
  /nix/store/fxg782wvrima1npr8n8ik3rp25k0g86b-iets-deps-0.2.0.drv
  /nix/store/qwpqibrshwz6z9qs7vzgcfnvmp8a0bw4-iets-nextest-0.2.0.drv